
TY  - JOUR
A1  - Swan, P 
T1  - On the Accuracy of the Tan hl Distorted Wave Approximation for Scattering Phase-Shifts
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1963
VL  - 16
IS  - 2
SP  - 177
EP  - 184
KW  - 
UR  - https://doi.org/10.1071/PH630177 
N2  - The distorted wave approximation for tan ?l involves a wave function distorted from its asymptotic form at r ® 8 by a form factor g1(r). Schwinger's variational principle is adapted to show that increasing the number of variable parameters in g1(r) does not necessarily improve the firs 
ER  -

